Keystone taps Alberta tar sands, the world's dirtiest fuel

"Keystone XL Pipeline." Friends of the Earth: "Pollution from tar sands oil greatly eclipses that of conventional oil. During tar sands oil production alone, levels of carbon dioxide emissions are three times higher than those of conventional oil, due to more energy-intensive extraction and refining processes. The Keystone XL pipeline would carry 900,000 barrels of dirty tar sands oil into the United States daily, doubling our country's reliance on it and resulting in climate-damaging emissions equal to adding more than six million new cars to U.S. roads."